LensRentals dissection and testing - confirms this an impressive optic - not least, confirming: "First, like every law, Roger’s Law that Zooms Are Never as Good as Primes has at least one very expensive exception. At one of its focal lengths. This zoom is ‘prime good’ at 300mm." ie compared against the 300mm f2.8G VRII
https://www.lensrentals.com/blog/2020/05/a-peak-inside-the-af-s-nikkor-120-300mm-f2-8-fl-ed-sr-vr/"The lens is well built in the old, classic Nikon F way. Obviously, we don’t think that’s pretty, and it’s not fun to work on. But it’s been an effective method of manufacturing for decades. The moving parts are solid, the chassis and assembly are solid, the weather resistance is as good as anything, maybe better."
MTF testing of a single copy against Sigma 120-300mm f/2.8 at 300mm: "...the Nikkor is significantly better than the Sigma. The Sigma, BTW, is a really good lens, so the Nikkor is just awesome...the Nikkor is significantly better than the Sigma. The Sigma, BTW, is a really good lens, so the Nikkor is just awesome...Again, I want to remind you this is just one lens. Whether other copies will behave this way, I have no clue yet. This one is great at 300mm, not so great at 200mm, and really good at 120mm, although not quite as good as at 300mm."
compare LR tests to Nikon's MTF curves: -
https://www.nikon-image.com/products/nikkor/fmount/af-s_nikkor_120-300mm_f28e_fl_ed_sr_vr/spec.html